#Recursion (part 2) exercise
##Chirp
run chirp.html
edit js/chirp.js
- define a function named chirp() that takes a single argument 'n'
- calling chirp(3) will return the text "chirp chirp chirp"
- chirp will call itself, each time returning "chirp "
##Letter counter
run letters.html
edit js/letters.js
- define a function named countLetters() that takes two arguments 'counter' and 'text'
- calling countLetters(counter, sample_text) will populate the counter object with a count of how many times letters occur
- countLetters will call itself until all letters are counted